32GB ECC is worth it for FreeNAS – if your hardware supports it.

Yes – but only if you can swap the RAM without replacing the motherboard and CPU. If you have to buy a whole new platform, the math gets shaky.

ZFS uses checksums to detect data corruption, but it can’t fix what the hardware feeds it. Non-ECC RAM can silently flip a bit in flight, and that corrupted data gets written to disk. ZFS will dutifully checksum the bad data and store it as “correct.” ECC catches that flip before